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Lee MH, Gooley J, Obeyesekere V, Lu J, Paldus B, Hendrieckx C, MacIsaac RJ, McAuley SA, Speight J, Vogrin S, Jenkins AJ, Holmes-Walker DJ, O'Neal DN, Ward GM. Hybrid Closed Loop in Adults With Type 1 Diabetes and Severely Impaired Hypoglycemia Awareness. J Diabetes Sci Technol 2024:19322968241245627. [PMID: 38613225 DOI: 10.1177/19322968241245627] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 04/14/2024]
Abstract
BACKGROUND Benefits of hybrid closed-loop (HCL) systems in a high-risk group with type 1 diabetes and impaired awareness of hypoglycemia (IAH) have not been well-explored. METHODS Adults with Edmonton HYPO scores ≥1047 were randomized to 26-weeks HCL (MiniMed™ 670G) vs standard therapy (multiple daily injections or insulin pump) without continuous glucose monitoring (CGM) (control). Primary outcome was percentage CGM time-in-range (TIR; 70-180 mg/dL) at 23 to 26 weeks post-randomization. Major secondary endpoints included magnitude of change in counter-regulatory hormones and autonomic symptom responses to hypoglycemia at 26-weeks post-randomization. A post hoc analysis evaluated glycemia risk index (GRI) comparing HCL with control groups at 26 weeks post-randomization. RESULTS Nine participants (median [interquartile range (IQR)] age 51 [41, 59] years; 44% male; enrolment HYPO score 1183 [1058, 1308]; Clarke score 6 [6, 6]; n = 5 [HCL]; n = 4 [control]) completed the study. Time-in-range was higher using HCL vs control (70% [68, 74%] vs 48% [44, 50%], P = .014). Time <70 mg/dL did not differ (HCL 3.8% [2.7, 3.9] vs control 6.5% [4.3, 8.6], P = .14) although hypoglycemia episode duration was shorter (30 vs 50 minutes, P < .001) with HCL. Glycemia risk index was lower with HCL vs control (38.1 [30.0, 39.2] vs 70.8 [58.5, 72.4], P = .014). Following 6 months of HCL use, greater dopamine (24.0 [12.3, 27.6] vs -18.5 [-36.5, -4.8], P = .014), and growth hormone (6.3 [4.6, 16.8] vs 0.5 [-0.8, 3.0], P = .050) responses to hypoglycemia were observed. CONCLUSIONS Six months of HCL use in high-risk adults with severe IAH increased glucose TIR and improved GRI without increased hypoglycemia, and partially restored counter-regulatory responses. CLINICAL TRIAL REGISTRATION ACTRN12617000520336.
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Affiliation(s)
- Melissa H Lee
- Department of Medicine, The University of Melbourne, Melbourne, VIC, Australia
- Department of Endocrinology and Diabetes, St Vincent's Hospital Melbourne, Melbourne, VIC, Australia
| | - Judith Gooley
- Department of Medicine, The University of Melbourne, Melbourne, VIC, Australia
| | - Varuni Obeyesekere
- Department of Endocrinology and Diabetes, St Vincent's Hospital Melbourne, Melbourne, VIC, Australia
| | - Jean Lu
- Department of Medicine, The University of Melbourne, Melbourne, VIC, Australia
| | - Barbora Paldus
- Department of Medicine, The University of Melbourne, Melbourne, VIC, Australia
- Department of Endocrinology and Diabetes, St Vincent's Hospital Melbourne, Melbourne, VIC, Australia
| | - Christel Hendrieckx
- School of Psychology, Deakin University, Geelong, VIC, Australia
- The Australian Centre for Behavioural Research in Diabetes, Diabetes Victoria, Melbourne, VIC, Australia
| | - Richard J MacIsaac
- Department of Medicine, The University of Melbourne, Melbourne, VIC, Australia
- Department of Endocrinology and Diabetes, St Vincent's Hospital Melbourne, Melbourne, VIC, Australia
| | - Sybil A McAuley
- Department of Medicine, The University of Melbourne, Melbourne, VIC, Australia
- Department of Endocrinology and Diabetes, St Vincent's Hospital Melbourne, Melbourne, VIC, Australia
- School of Public Health and Preventive Medicine, Monash University, Melbourne, VIC, Australia
- Department of Endocrinology & Diabetes, The Alfred, Melbourne, VIC, Australia
| | - Jane Speight
- School of Psychology, Deakin University, Geelong, VIC, Australia
- The Australian Centre for Behavioural Research in Diabetes, Diabetes Victoria, Melbourne, VIC, Australia
| | - Sara Vogrin
- Department of Medicine, The University of Melbourne, Melbourne, VIC, Australia
| | - Alicia J Jenkins
- Department of Medicine, The University of Melbourne, Melbourne, VIC, Australia
- Department of Endocrinology and Diabetes, St Vincent's Hospital Melbourne, Melbourne, VIC, Australia
- National Health and Medical Research Council Clinical Trials Centre, The University of Sydney, Sydney, NSW, Australia
| | - D Jane Holmes-Walker
- Department of Endocrinology, Westmead Hospital, The University of Sydney, Sydney, NSW, Australia
| | - David N O'Neal
- Department of Medicine, The University of Melbourne, Melbourne, VIC, Australia
- Department of Endocrinology and Diabetes, St Vincent's Hospital Melbourne, Melbourne, VIC, Australia
| | - Glenn M Ward
- Department of Medicine, The University of Melbourne, Melbourne, VIC, Australia
- Department of Endocrinology and Diabetes, St Vincent's Hospital Melbourne, Melbourne, VIC, Australia
- Department of Clinical Biochemistry, St Vincent's Hospital Melbourne, Melbourne, VIC, Australia
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Lee MH, Vogrin S, Paldus B, Jayawardene D, Jones HM, McAuley SA, Obeyesekere V, Gooley J, La Gerche A, MacIsaac RJ, Sundararajan V, Jenkins AJ, Ward GM, O'Neal DN. Glucose and Counterregulatory Responses to Exercise in Adults With Type 1 Diabetes and Impaired Awareness of Hypoglycemia Using Closed-Loop Insulin Delivery: A Randomized Crossover Study. Diabetes Care 2020; 43:480-483. [PMID: 31796571 DOI: 10.2337/dc19-1433] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/21/2019] [Accepted: 11/03/2019] [Indexed: 02/03/2023]
Abstract
OBJECTIVE To evaluate exercise-related glucose and counterregulatory responses (CRR) in adults with type 1 diabetes with impaired awareness of hypoglycemia (IAH) using hybrid closed-loop (HCL) insulin delivery to maintain glucose homeostasis. RESEARCH DESIGN AND METHODS Twelve participants undertook 45-min high-intensity intermittent exercise (HIIE) and moderate-intensity exercise (MIE) in random order. The primary outcome was continuous glucose monitoring (CGM) time in range (70-180 mg/dL) for 24-h post-exercise commencement. RESULTS CGM time in range was similar for HIIE and MIE (median 79.5% [interquartile range 73.2, 87.6] vs. 76.1% [70.3, 83.9], P = 0.37), and time with levels <54mg/dL post-exercise commencement was 0%. HIIE induced greater increases in cortisol (P = 0.002), noradrenaline (P = 0.005), and lactate (P = 0.002), with no differences in adrenaline, dopamine, growth hormone, or glucagon responses. CONCLUSIONS IAH adults using HCL undertaking HIIE and MIE exhibit heterogeneity in CRR. Novel findings were a preserved cortisol response and variable catecholamine responses to HIIE.
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Affiliation(s)
- Melissa H Lee
- University of Melbourne, Department of Medicine, Melbourne, Australia.,Department of Endocrinology and Diabetes, St Vincent's Hospital Melbourne, Melbourne, Australia
| | - Sara Vogrin
- University of Melbourne, Department of Medicine, Melbourne, Australia
| | - Barbora Paldus
- University of Melbourne, Department of Medicine, Melbourne, Australia
| | | | - Hannah M Jones
- University of Melbourne, Department of Medicine, Melbourne, Australia.,Department of Endocrinology and Diabetes, St Vincent's Hospital Melbourne, Melbourne, Australia
| | - Sybil A McAuley
- University of Melbourne, Department of Medicine, Melbourne, Australia.,Department of Endocrinology and Diabetes, St Vincent's Hospital Melbourne, Melbourne, Australia
| | - Varuni Obeyesekere
- Department of Endocrinology and Diabetes, St Vincent's Hospital Melbourne, Melbourne, Australia
| | - Judith Gooley
- University of Melbourne, Department of Medicine, Melbourne, Australia
| | - André La Gerche
- Department of Cardiology, St Vincent's Hospital Melbourne, Melbourne, Australia.,Clinical Research Domain, Baker Heart and Diabetes Institute, Melbourne, Australia
| | - Richard J MacIsaac
- University of Melbourne, Department of Medicine, Melbourne, Australia.,Department of Endocrinology and Diabetes, St Vincent's Hospital Melbourne, Melbourne, Australia
| | - Vijaya Sundararajan
- University of Melbourne, Department of Medicine, Melbourne, Australia.,Department of Public Health, La Trobe University, Melbourne, Australia
| | - Alicia J Jenkins
- University of Melbourne, Department of Medicine, Melbourne, Australia.,Department of Endocrinology and Diabetes, St Vincent's Hospital Melbourne, Melbourne, Australia.,NHMRC Clinical Trials Centre at the University of Sydney, Sydney, Australia
| | - Glenn M Ward
- Department of Endocrinology and Diabetes, St Vincent's Hospital Melbourne, Melbourne, Australia.,Department of Pathology, University of Melbourne, Melbourne, Australia
| | - David N O'Neal
- University of Melbourne, Department of Medicine, Melbourne, Australia .,Department of Endocrinology and Diabetes, St Vincent's Hospital Melbourne, Melbourne, Australia
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